Image icon  Fe, C 0.85 (wt%), hypereutectoid alloy

 
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Description: This is a hypereutectoid alloy and illustrates the effect of slow cooling rate on the resultant microstructure. The first phase to form from the melt is proeutectoid cementite. With slow cooling, furnace cooled, allotriomorph cementite forms on the prior austenite grain boundaries, rejecting iron into the melt. At the eutectoid composition the remaining austenite transforms to pearlite.
Keywords: allotriomorph • alloy • carbon • cementite • hypereutectoid • iron • metal • steel
Categories: Science approaches > Microstructure
Materials > Metals & alloys > Carbon steels
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: Prof T W Clyne, Department of Materials Science and Metallurgy, University of Cambridge
DoITPoMS, University of Cambridge
Published by: DoITPoMS, University of Cambridge
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Date created: 25 October 2001
Date added: 21 August 2009
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Resource ID: 1089